Malicious PDF — malware analysis report

Static analysis result for SHA-256 be97e59e491d7ad6…

MALICIOUS

PDF

79.2 KB Created: 2021-09-20 08:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8ae4d53323cab9f87dae5c83c1b847de SHA-1: b1b3bb827a9938b119d22aa508b2a2ebc48ea31c SHA-256: be97e59e491d7ad6590007e414f822b2890829ab6b61f17f641589f26c3a82c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=hex+to+little+endian+converter PDF link annotation
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374df73f3d8---28421096320.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/zudanutoveriwomimasu.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/fawelojipaxi.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/59371240735.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/324b38lin19j1cqld3f8aplo9s/92028731909.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/5434369555.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161404a653e352---wused.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/saguwapavotabivak.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/71576885270.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/jujigekegesobujamozob.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/kotejokasigarugamagabilu.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/juvobuwonofeji.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614633d1561f1---61157114081.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/77033691549.pdfIn PDF document text
    • https://melz-feu.ru/upload/wozilun.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/39272944612.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/4495111901.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/pesijuv.pdfIn PDF document text
    • http://meditopthailand.com/file/64930601602.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/58154253467.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/vevenelerokerewapuvateren.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/47636215334.pdfIn PDF document text
    • https://tavio.ru/files/file/sezofakibugul.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/79665653407.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/dugijev.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/69466682903.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210908021950.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7C 18556 bytes
SHA-256: 9edf042ec2042f30153a712436c8d903bb38cccf4d541c7c35bce30c0f9c7691
font_01_sfnt_off0000ffd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD6 10352 bytes
SHA-256: c49ab8495e66fbf16d80567d4112082ffe3748d69b1b549c3ebb17f79a2aa6b3
font_02_sfnt_off0001174d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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